This part is a kind of semiconductor called MA1050.

Function of this product has Power Switching Regulators.

Manufacturers : Shindengen Electric Mfg.Co.Ltd

Image and pinout :

Some of the text within the PDF file :

SHINDENGEN Power Switching Regulators MA1000 Series MA1050 OUTLINE DIMENSIONS Case : MA7 Unit : mm RATINGS ●Absolute Maximum Ratings Item Storage Temperature Operating Temperature Junction Temperature Peak Input Voltage Input Current Maximum Operating Frequency Maximum Power Dissipation Dielectric Strength Insulation Resistance Fold Back Control Voltage Fold Back Control Current Symbol Tstg Top Tj Vin Iin f(max) PD PD Vdis Case Temperature Conditions Ratings P Class N Class Unit ℃ ℃ ℃ V A kHZ W W kV MΩ V mA Unit mA V ℃/W μA V V ②+,④-,Fig.1 is Measurement Circuit of Peak Input Voltage Vin and Collector Cutoff Current ICEX. Pulse Pulse Width 150μs MAX, Duty1/2, Sawtooth Wave, Peak Value, ②+,④- Ta=25℃ Heatsink Tc=100℃ Terminals To Case AC 1 min Terminals To [ ... ]

MA1050 PDF Datasheet Download